US2748147A - 2, 5-dialkoxy-3, 4-dihydroxytetrahydrofurans and their hydrolysates, and methods of producing them - Google Patents
2, 5-dialkoxy-3, 4-dihydroxytetrahydrofurans and their hydrolysates, and methods of producing them Download PDFInfo
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- US2748147A US2748147A US295126A US29512652A US2748147A US 2748147 A US2748147 A US 2748147A US 295126 A US295126 A US 295126A US 29512652 A US29512652 A US 29512652A US 2748147 A US2748147 A US 2748147A
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- dialkoxy
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
- C07D307/04—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having no double bonds between ring members or between ring members and non-ring members
- C07D307/18—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having no double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D307/20—Oxygen atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/56—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds
- C07C45/57—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds with oxygen as the only heteroatom
- C07C45/59—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds with oxygen as the only heteroatom in five-membered rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C47/00—Compounds having —CHO groups
- C07C47/02—Saturated compounds having —CHO groups bound to acyclic carbon atoms or to hydrogen
- C07C47/19—Saturated compounds having —CHO groups bound to acyclic carbon atoms or to hydrogen containing hydroxy groups
Definitions
- This invention relates to 2,5 ,-dialkoxy-3,4-dihydroxytetrahydrofurans of the general formula:
- the invention further relates to hydrolysates of the said components and to methods for the production of the compounds and hydrolysates.
- the compounds of the invention are hitherto unknown substances which are acetals of 2,3-dihydroxy-L4-dicar bonyl compounds.
- hydrolysis dicarbonyl compounds are obtained, which are useful as intermediates in the synthesis of alkaloids of the tropinone series and may also find use in the production of otherwise difiicultly accessible carbohydrates.
- An alkali permanganate such as potassium permanganate, is preferably used as the oxidizing agent, and the oxidation is expediently carried out in aqueous solution at a temperature below C.
- the 2,5-dialkoxy-2,S-dihydrofurans used in the reaction are preferably those which are produced as described in my co-pending application, Serial No. 163,801, filed May 23, 1950 now abandoned.
- PatentO '2 furan may be hydrolyzed to tartaric dialdehyde according to the following scheme:
- Example 1 Thepermanganateis-usedmomentaneously.
- the col-loidally precipitated manganese dioxide is brought into a filterable form and may be filtered on: after cooling.
- the manganese dioxide is further washed with 300 ccs. of water, which are added to the filtrate.
- 750 g. of potassium carbonate are also added, and the filtrate isthen continuously extractedwith ether.
- the ether solution is dried with sodium sulphate and evaporated in vacuum. The residue, amounting to 26 g., is distilled in vacuum. Thereby 10.2 g. or 26% of 3 the starting material is regained and there is further obtained 13.5 g.
- the product is a mixture of different stereoisomers.
- the oxidation may also be carried out at a lower temperature, for in stance' at 20 C., using a mixture of acetone and water as a solvent, the yield being about the same as by the above method.
- the tetrahydrofurans may be hydrolyzed as follows.
- Example 2 The method described in Example 1 is applied to 15.8 g. (0.10 mole) of 2,5-diethoxy-2,S-dihydrofuran resulting in 5.5 g. of 2,5-diethoxy-3,4-dihydroxy-tetrahydrofuran, which is a colourless oil, the boiling point of which at 9 mm. is 157-158 C. and the refractive index of which 21 at 25 C. is 1.449.
- Example 4 Using 18.6 g. (0.10 mole) of 2,5-diisopropoxy-2,5-dihydrofuran as a starting material in a method as described in Example 1, 6.9 g. of 2,5-diisopropoxy-3,4-dihydroxytetrahydrofuran are obtained as colourless crystals, melting at 51-52 C.
- Example 6 20.4 g, of 2,5dimethoxy-2,S-dihydrofurfuryl dimethylacetal (0.10 mole) is reacted as described in Example 1, whereby 3.8 g. of the starting material is regained, and there is obtained 0.7 g. of 2,5 dimethoxy 3,4- dihydroxy-tetrahydrofurfuraldimethyl acetal,
- R1 is selected from the group consisting of hydrogen, an alkyl group containing less than 4 carbon atoms, and the following saturated aliphatic groups comprising carbon, hydrogen and oxygen only, containing less than 4 carbon atoms: CH2O-(lower fatty acid acyl); CH(O-lower alkyl)2; and COO-(lower alkyl).
- a method for the production of a 2,5-dia1koxy-3,4- dihydroxytetrahydrofuran which comprises treating a 2,5- dialkoxy-2,5-dihydrofuran of the general formula R] R1 0 0a with potassium permanganate in an aqueous solution at a temperature below 5 C., where R is an alkyl group containing less than 7 carbon atoms and R1 is selected from the group consisting of hydrogen, an alkyl group containing less than 4 carbon atoms, and the following saturated aliphatic groups comprising carbon, hydrogen and oxygen only, containing less than 4 carbon atoms: -CH2O (lower fatty acid acyl); --CH(O-lower alkyl).-;; and -COO-(lower alkyl).
- R is an alkyl group containing less than 7 carbon atoms and R1 is selected from the group consisting of hydrogen, an alkyl group containing less than 4 carbon atoms, and the following saturated alipha
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- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
Description
2,5 DIALKOXY 3,4 DIHYDROXYTETRAHYDRO- FURANS AND THEIR HY DROLYSATES, AND METHODS OF PRODUCING THEM Niels Konrad Friedrich Wilhelm Clauson-Kaas, Klampenberg, Denmark, assignor to A/S Sadolin & Holmblad, Copenhagen, Denmark No Drawing. Application June 23, 1952, Serial No. 295,126
Claims priority, application Denmark JulyS, 1951 9Claims. or. 260-3414) This invention relates to 2,5 ,-dialkoxy-3,4-dihydroxytetrahydrofurans of the general formula:
no i on EFL JiRl no O oa where R designates alkyl groups, and R1, R2, R3 and R designate hydrogen, alkyl groups or aliphatic groups containing only carbon, hydrogen and oxygen atoms.
The invention further relates to hydrolysates of the said components and to methods for the production of the compounds and hydrolysates.
The compounds of the invention are hitherto unknown substances which are acetals of 2,3-dihydroxy-L4-dicar bonyl compounds. By the hydrolysis dicarbonyl compounds are obtained, which are useful as intermediates in the synthesis of alkaloids of the tropinone series and may also find use in the production of otherwise difiicultly accessible carbohydrates.
The objects of the invention will appear from the above and from the following detailed description of preferred embodiments of the invention, but it should be understood that the scope of the invention is not to be limited by the following particulars, since modifications will be obvious to anyone skilled in the art.
According to the invention 2,5-dialkoxy-2,5-dihydrofurans of the following general formula:
R4 LR] R07 OR where R, R1, R2, R3 and R4 have the above significance, are treated with an oxidizing agent, which hydroxylates the double bond, whereafter the resulting 3,4-dihydroxy compounds are isolated and, if desired, hydrolyzed in known manner. An alkali permanganate, such as potassium permanganate, is preferably used as the oxidizing agent, and the oxidation is expediently carried out in aqueous solution at a temperature below C.
The 2,5-dialkoxy-2,S-dihydrofurans used in the reaction are preferably those which are produced as described in my co-pending application, Serial No. 163,801, filed May 23, 1950 now abandoned.
Using 2,5-dimethoxy-2,5-dihydrofuran as a starting material, the reaction is illustrated by the following scheme:
HO OH H 0 01 0 CH: O 0
nitcd States PatentO '2 furan may be hydrolyzed to tartaric dialdehyde according to the following scheme:
HO OH 1' E B100 0 OCH! In the following the invention will be illustrated by some examples.
HO OH 2011.0 CH0 CH0 Example 1 Thepermanganateis-usedmomentaneously. By a short hatingto-65 C. the col-loidally precipitated manganese dioxide. is brought into a filterable form and may be filtered on: after cooling. The manganese dioxide is further washed with 300 ccs. of water, which are added to the filtrate. 750 g. of potassium carbonate are also added, and the filtrate isthen continuously extractedwith ether. The ether solution is dried with sodium sulphate and evaporated in vacuum. The residue, amounting to 26 g., is distilled in vacuum. Thereby 10.2 g. or 26% of 3 the starting material is regained and there is further obtained 13.5 g. of 2,5-dimethoxy-3,4-dihydroxy-tetrahydrofuran, the boiling point of which at 11 mm. of mercur y is C., and the refractive index n at 25 C. of which is 1.452-1.454. The product is a colourless, viscous oil, in some casescrystallizing partly. It is probably a mixture of dilferent stereoisomers.
Probably, the product is a mixture of different stereoisomers.
The oxidation may also be carried out at a lower temperature, for in stance' at 20 C., using a mixture of acetone and water as a solvent, the yield being about the same as by the above method.
The tetrahydrofurans may be hydrolyzed as follows.
0.25 g. of 2,5-dimethoxy-3,4-dihydroxy-tetrahydrofuran are dissolved in 2 ccs. of decinormal sulphuric acid and left standing for 3 hours at room temperature. Thereby tartaric dialdehyde is formed and may be isolated as a bis-phenylhydrazone in the following manner. 2 ccs. of water, 3-normal acetic acid solution and 4-normal sodium acetate solution, respectively, are added together with 0.4 ccs. of phenylhydrazine. A slightly yellow precipitate of bis-phenylhydrazone is recovered and re-crystallized from acetone-benzene and is now pure white with melting point 193l94 C.
Example 2 The method described in Example 1 is applied to 15.8 g. (0.10 mole) of 2,5-diethoxy-2,S-dihydrofuran resulting in 5.5 g. of 2,5-diethoxy-3,4-dihydroxy-tetrahydrofuran, which is a colourless oil, the boiling point of which at 9 mm. is 157-158 C. and the refractive index of which 21 at 25 C. is 1.449.
Example 3 Applying the method of Example 1 to 18.6 g. (0.10 mole) of di-n-propoxy-2,S-dihydrofuran results in 4.1 g. of 2,5-di-n-propoxy-3,4-dihydroxy-tetrahydrofuran which is a colourless liquid boiling at 171-172 C. at 9 mm. and having the refractive index n at 25 C.=l.447.
Example 4 Using 18.6 g. (0.10 mole) of 2,5-diisopropoxy-2,5-dihydrofuran as a starting material in a method as described in Example 1, 6.9 g. of 2,5-diisopropoxy-3,4-dihydroxytetrahydrofuran are obtained as colourless crystals, melting at 51-52 C.
Example 20.2 g. of 2,5-dimethoxy-2,S-dihydrofurfuryl acetate (0.10 mole) are dissolved in 200 cos. of water and 12.0 g. of potassium permanganate (0.076 mole) dissolved in 300 cos. of water are added during 30 minutes as described in Example 1. Then 71.5 cos. of normal sulphuric acid and 1.0 cos. of normal acetic acid are added, and the mixture is extracted continuously with benzene during hours. From the solution in benzene 7.96 g.=39% of the starting material may be regained. From the aqueous phase manganese dioxide is removed by filtration, and the filtrate is extracted continuously with ether during 24 hours. The ethereal solution yields 2.27 g. of 2,5-dimethoxy-3,4-dihydroxy-tetrahydrofurfuryl acetate, B. P.o.4=133-137 C., n =1.460.
Example 6 Example 7 20.4 g, of 2,5dimethoxy-2,S-dihydrofurfuryl dimethylacetal (0.10 mole) is reacted as described in Example 1, whereby 3.8 g. of the starting material is regained, and there is obtained 0.7 g. of 2,5 dimethoxy 3,4- dihydroxy-tetrahydrofurfuraldimethyl acetal,
B. P.1e=171-175 C., n =l.453
I claim:
1. 2,5 dialkoxy 3,4 dihydroxy tetrahydrofurans of the general formula:
atoms and R1 is selected from the group consisting of hydrogen, an alkyl group containing less than 4 carbon atoms, and the following saturated aliphatic groups comprising carbon, hydrogen and oxygen only, containing less than 4 carbon atoms: CH2O-(lower fatty acid acyl); CH(O-lower alkyl)2; and COO-(lower alkyl).
2. 2,5-dimethoxy-3,4-dihydroxy-tetrahydrofuran.
3. 2,5-diethoXy-3,4-dihydroxy-tetrahydrofuran.
4. 2,5-dimethoxy-3,4 dihydroxy tetrahydrofurfuryl acetate.
5. 2,5-dirnethoxy 3,4 dihydroxy tetrahydropyromusic acid methyl ester.
6. 2,5 dimethoxy-3,4 dihydroxy-tetrahydrofurfural dimethyl acetal.
7. 2,5-di(lower alkoxy)-3,4-dihydroxytetrahydrofuran.
8. A method for the production of a 2,5-dia1koxy-3,4- dihydroxytetrahydrofuran which comprises treating a 2,5- dialkoxy-2,5-dihydrofuran of the general formula R] R1 0 0a with potassium permanganate in an aqueous solution at a temperature below 5 C., where R is an alkyl group containing less than 7 carbon atoms and R1 is selected from the group consisting of hydrogen, an alkyl group containing less than 4 carbon atoms, and the following saturated aliphatic groups comprising carbon, hydrogen and oxygen only, containing less than 4 carbon atoms: -CH2O (lower fatty acid acyl); --CH(O-lower alkyl).-;; and -COO-(lower alkyl).
9. The method of claim 8, wherein the tetrahydrofuran is further hydrolyzed to a dicarbonyl compound.
. 7 References Cited in the file of this patent Sheehan et al.: JACS 74, pp. 3825-28 (recd Jan. 7,
1952). Bergmann et al.': Berichte 63, pp. 1911-17 (1930).
Claims (1)
1. 2,5 - DIALKOXY -3,4- DIHYDROXY - TETRAHYDROFURANS OF THE GENERAL FORMULA:
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK2748147X | 1951-07-05 |
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| Publication Number | Publication Date |
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| US2748147A true US2748147A (en) | 1956-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US295126A Expired - Lifetime US2748147A (en) | 1951-07-05 | 1952-06-23 | 2, 5-dialkoxy-3, 4-dihydroxytetrahydrofurans and their hydrolysates, and methods of producing them |
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| US (1) | US2748147A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3345337A (en) * | 1962-07-25 | 1967-10-03 | Hoechst Ag | Process for the manufacture of film-and fiber-forming polyesters |
| US4900324A (en) * | 1987-05-18 | 1990-02-13 | The United States Of America, As Represented By The Secretary Of Agriculture | Agents for non-formaldehyde durable press finishing and textile products therefrom |
-
1952
- 1952-06-23 US US295126A patent/US2748147A/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| None * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3345337A (en) * | 1962-07-25 | 1967-10-03 | Hoechst Ag | Process for the manufacture of film-and fiber-forming polyesters |
| US4900324A (en) * | 1987-05-18 | 1990-02-13 | The United States Of America, As Represented By The Secretary Of Agriculture | Agents for non-formaldehyde durable press finishing and textile products therefrom |
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